The correct statement(s) about Cr₂⁺ and Mn₃⁺ is/are:
A Cr₂⁺ is a reducing agent
B Mn₃⁺ is an oxidising agent
C Both Cr₂⁺ and Mn₃⁺ exhibit d₄ electronic configuration
D When Cr₂⁺ is used as a reducing agent the chromium ion attains a d5 electronic configuration
